Geometry Tool
Pythagorean Theorem Calculator
Use the Pythagorean theorem to solve for a missing side of a right triangle. Enter two known sides and calculate side a, side b, or hypotenuse c.
Enter two known sides
Choose which side you want to solve for, then enter the two known measurements. The calculator uses a² + b² = c².
Formula used:
a² + b² = c²
c = √(a² + b²)
a = √(c² − b²)
b = √(c² − a²)
a² + b² = c²
c = √(a² + b²)
a = √(c² − b²)
b = √(c² − a²)
Missing Side
0
Triangle Area
0
Side a
0
Side b
0
Side c
0
Perimeter
0
Formula applied
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Right triangle check
Valid right triangle
This calculator assumes a right triangle where a and b are the legs and c is the hypotenuse. The hypotenuse must always be the longest side.
